#include <stdio.h>

//这是不好的示范，千万不要这样去写
#define fun(x,y) x*y

void func2()
{
    printf("hehehehe\n");
}

void func1()
{
    func2();
}

void func()
{
    func1();
}

int main()
{  
    int i = 10;
    int* p = &i;
    *p = 20;

    printf("%d\n", *p);
    func();
    printf("%d\n", fun(10, 20));
    printf("%d\n", fun(10 + 20, 20));
    printf("Are you eating\n");
    return 0;
}
